Modulator with improved sensitivity and life time

a moduler and sensitivity technology, applied in the field of liquid crystal materials, can solve the problems of reducing power consumption and battery life, affecting test apparatus, and affecting the operation of the test apparatus, and achieve the effect of reducing the operating voltag

Active Publication Date: 2010-10-19
ORBOTECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016]In some embodiments, the present invention provides a method of making an NCAP electro-optic material. The method comprises combining a liquid crystal material with a latex emulsion. The liquid crystal material is emulsified in the presence of at least one interfacial agent to form an emulsion comprising droplets of the liquid crystal material. The emulsion is applied to a substrate and dried to encapsulate the droplets with a latex based matrix. An amount of the interfacial agent is sufficient to decrease an operating voltage at which a molecular orientation of the liquid crystal material changes to transmit light through the material.

Problems solved by technology

Due to the close proximity of components relative to panels under test (PUT), LC / polymer modulator structures can be subject to damage in normal use by unwanted particles, which severely curtails useful life.
In addition, some applications such as LC computer displays for notebooks can be sensitive to power consumption, such that improved sensitivity with lower voltages can lead to decreased power consumption and increased battery lifetime.
For example, particulate contamination can damage test apparatus, for example a voltage imaging system and / or the panel under test.
Also, test apparatus sensitivity may be less than ideal.

Method used

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  • Modulator with improved sensitivity and life time
  • Modulator with improved sensitivity and life time
  • Modulator with improved sensitivity and life time

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0086]Latex-based NCAP formulation MLC-7022-100 / Neorez R-967 (manufactured by EM Industries and NeoResins a division of Avecia, respectively) with 67 / 33 wt % ratio is selected as a base liquid crystal material. Any one of the interfacial agents shown in Table 1 is selected, for example an interfacial agent comprising Surfynol DF type defoamer. The interfacial agent from Table 1 is added in quantity of approximately 1-5 wt-% of total solid content. In some embodiments, the interfacial agent selected from Table 1 can be added in quantities up to 10% by weight. All components are mixed with a high speed blender to form NCAP emulsion and coated on a substrate with an ITO film. The NCAP latex based emulsion coated on the substrate is allowed to dry and laminated with ITO substrate. The transmission curve is then measured. The driving voltage versus percent transmission curve is shown in FIG. 6. As shown, a lower driving voltage between the electrodes is required for the NCAP formulation ...

example 2

[0087]A solvent-induced phase separation PDLC formulation TL205 / AU1033 (manufactured by EM Industries, and Rohm and Haas, respectively) with 67 / 33 wt-% ratio is selected as a base liquid crystal material. Methyl isobutyl ketone is used as solvent and Isocyanate such as Desmodur N75 BA / X made by Bayer is added into the mixture as cross-linking agent. Any one of the interfacial agents of Table 1 can be selected, for example Surfynol DF type defoamer. The interfacial agent selected from Table 1 was added in varying quantities of 0, 1.0, 1.9 and 3.0%. In some embodiments, the interfacial agent selected from Table 1 can be added in quantities of 4, 5 and up to 10% by weight. The resulting driving voltage vs. percent transmission curve is shown in FIG. 7. Slight heating is applied on the PDLC coating to accelerate the crosslink between hydroxyl groups (in both interfacial agent and AU1033) with isocyanate. As shown, a more than 50% lower driving voltage is required for the PDLC formulatio...

example 3

[0089]An organic hard coating comprising of multi-functional acrylates, silicon acrylate as a slip agent, nano-sized silica as an inorganic filler, a (meth)acrylate terminated toughener and photo-initiators is applied to a Mylar sheet. The organic hard coating has 3H to 6H pencil hardness, good adhesion to Mylar, and slippery surface. The thickness of organic hard coating is approximately 5 microns. The dielectric constants of the organic and organic / inorganic hybrid hard coatings are in the range of 3˜5, well less than a dielectric of 30 that can impact the spatial resolution and therefore the EO performance of the modulator. The coating can be softer than thin film transistor (TFT) panel so that the modulator will not damage the panel in case the modulator touches the panel. The hard coating layer is added to the assembly stack as described above.

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Abstract

An electro-optic modulator assembly includes a sensor layer made from an electro-optic modulator material that comprises liquid crystal droplets encapsulated within a polymer matrix. The sensor layer material comprises an interfacial agent, for example a defoaming agent, in an amount sufficient to lower an intrinsic operating voltage at which the sensor layer transmits light. The defoaming agent can comprise from about 1 to about 10 percent by weight of the electro-optic modulator material, and the defoaming agent may comprise a reactive component to react with the polymer matrix, for example at least one of a siloxane with a reactive end group, a reactive fluorinated polymer or a non-ionic block copolymer to react with the polymer matrix. The assembly can also include a hard coating layer to protect the sensor layer.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to liquid crystal materials for use in electro-optic applications. More particularly, the present invention relates to liquid crystal / polymer composite materials, and methods and apparatus for the manufacture and application of such composite materials. Merely by way of example, the materials, methods and apparatus of the present invention are described with reference to a voltage imaging system. The materials, methods and apparatus of the present invention can be used with other electro-optic applications, for example liquid crystal composite materials used in flat panel displays.[0002]Voltage imaging technology may be employed to detect and measure for defects in flat panel thin film transistor (TFT) arrays. According to this measurement technique, the performance of a TFT array is simulated as if it were assembled into a TFT cell and then the characteristics of the TFT array are measured by indirectly measuring actual...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G02F1/01C09K19/38C09K19/54G02F1/135C09K19/04G02F1/1334
CPCC09K19/544G02F1/1334Y10T428/10Y10T428/1059C09K2323/00C09K2323/05
Inventor CHEN, XIANHAI
Owner ORBOTECH LTD
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